To provide a cylinder lock capable of easily preventing a picking, at the same time, installing tumblers of integral multiple because of having a plurality of key holes and manufacturing extremely various kinds of locks in comparison with before in a state to remain unchanged in the length of a rotor.

In the cylinder lock having a cylinder body and the rotor capable of being engaged with the cylinder body by a plurality of tumblers and being rotatably placed in the cylinder body, making each tumbler operate by inserting a key into the cylinder body and rotating the rotor to unlock after the engagement of the cylinder body with the rotor has been released, it is so constituted that a plurality of key holes are formed in the rotor and, at the same time, that the tumbler is set in each of the key holes.